Boiler circulator



May 29, 1928.

P. G. KAISER BOILER CIRCULATOR @01m uw Patented May 29, 1928.

rias

i,a7i,371

BOILER oiRcULAToR.

Application fied January 5, 1925. serial No. 473.

My invention relates to an improvement in iire tube boilers'7 whereby a more eiiicient circulation can be effected. The chiet` object of my invention is the prevention of the so-called end circulation or longitudinal movement of the water in circulating over the iire tubes.

In Patent No. 880,080 previously granted to me February 25, 1908, I disclosed the use of spaced baiiie plates between groups of tire tubes which would shield a vertical region from the heat ofthe tubes and thus provide a relatively cool vertical passageway for the downward flow of water. A further object of my present invention is to check any tendency toward end circulation in boilers equipped with the plates of my'prior patent, and to check the longitudinal flow especially in the regions between 'the spaced plates. Another objectis to retard the tendency of the water above the uppermost tubes to flow longitudinally. f

A still further object of my invention is to provide some means of further retarding end-circulation in boilers where, because of their expense or for other reasons, it is not feasible to supply additional circulating' plates. I contemplate also the use of means for checking the longitudinal iiow of the water in its upward movement as well as in its downward movement.

Still another object of my invention is the elimination of vibration or rattling of thev spaced circulating plates shown in my aforesaid patent` which would tend to wear away the walls of the fire tubes. A

. These and additional objects `and advanv tages of my invention are set forth in the following description of a speciiicembodi-y ment thereof, which is illustrated in the accompanying drawings. wherein Figure 1 is a longitudinal vertical section through a boiler provided with my circulators on the line 1-1 of Fig. 2;

Figure 2 is a transverse section j through the boiler; and

' Fig. 3 is a transverse fragmentary sectionl taken on the line 3 3 of Fig. 2.

The boiler 10 is supported above the furnace chamber 11 with the ends of the fire tubes 12 opening into the fire chamber 13, while their other ends open into the smoke box 14. The tire tubes 12, which are arranged in vertical tiers rather than being vertically staggered, are divided by vertical spaces 15 into'one central and two outer groups. lIn each space 15 is afpai'r of cirl 'FCE." u f PAUL G; KAISER, oFcHIcAGo, ILLINOIS.

culating plates 16 disposed in contact with l the respectiveadjacent tiers of fire tubes and suspended by angle iron bracket strips 17 riveted to the plates and curved outwardly v at the upper ends to embrace the upper tubes oit' the adjacent ftiers, as indicated at"18.

The circulating plates terminate siX inches 'the boiler ends.

' The use of the circulating plates as thus far described, adds greatly vto the capacity of the boiler because it confines a major portion of lthe .downward flowof water to the relatively cool spaces between the plates i which shield the` spaces from the heat of the tire tubes. The downward flow of water between these plates is not resisted by the upward force of the hot water, as vwould be the case if no place for plates or spaces were provided and the waterl was left to find its way downwardly between the closely spaced heated, tubes. As is well known to boiler engineers, the tendency of the water is to flow upwardly atthe ends of the tire tubes and downwardly intermediate their ends in something of a cross flow, so that the circuit resembles alaterally disposed figure 8.-

The spaced plates, however, do not elimi-` l nate this circuitous end-to-end i'low ofthe water/which impedes the speedy and` direct 'circulation of the'water essential to securing a" maximum capacity and eiiiciency for the boiler. In carrying out my present invention, Ifprovide al plurality of transversely j disposed baiiie strips 20 which in appearance are not unlike large T-squares, for their upperendsare provided with bale headsy 21 adapted to overlie the vupper iire tubes of the adjacent tiers and support thev baiiie' through the manhole 22 and lpass them' upf wardly between the plates in a planepar allel thereto and then, after the batiie head 2l is above the tops of the tubes, ltwist the strip 20 te its transverse pasti-.ion and, if

y watericircuitto vertical paths.

iinally positioned between the plates 'they tend to urge the plates apart under strong tension and into tirni engagement with they adjacent tier of tubes, whereby any vibration against `the tube is precluded and there is no danger of -the continued knocking of the plates .against the tubes lin time wearing holes through the walls of the tubes.

, The water which flows downwardly be- Utween the spaced circulatingplates 16 vis lconined to a substantially vertical iiiovement, r.and since niost ot the downward Vflow rof water is between the plates, ithe end circulation. as to the downwardilow at least, is prevented. Thilo the transverse battle Ystrips 20 do not themselves directly preclude end1or longitudinal circulation ot vthe upllowingwater, they do prevent it indirectly by conliiiing the` downward --portion of the tendency ottheup-flowing water alone is to .travel vertically, and it is the unequal coun- :terfpressures ot-fthe downwardly lowing walter which start end circulation.L

Iny niost boilers ,the normal boiler level is *several inches above theftops oi the tubes,

and as' this region is unobstructed in the ordinary-boiler, it is `the region where the cold- .enwater will niost .easily travel longitudinelly;v vWater Ais forced lupwardly over the regions .ot the boiler having the greatest heat, and the water .naturally will flow lonf gitudinally above `the tubes toward areas n, over the cooler regions of ,the tubes where it Vcan'dow downwardly. lt is thus apparent tliatfagieat deal of theend circulation of the water .originates inthe region abovewtlie tubes, .and it the end circulation can be p checked at its source, it will be unable to developto a serious extent. It is with a. view to checking this end circulation at its .source that I .provide the previously mentioned l.battle heads` 2l which, ii desired, may be longer than l liaveshown toforin a morey 'complete transverse barrier above the tubes.

` :liuse ,the battle heads at the Vtops only of the stripsfl, thereby permitting convenient access to the lower partof the boiler.

,1n thedrawings l have shown the central ,group of fire tubes divided byv a narrow spaw23 much less in widthlthan the spaces butV greater than the'dist'ance betweenthe ether .tiere ef 'tubes In this space I ,Place narrower baille strips 24e provided with baille heds at their upper ends and Suspended t-liereby. The lower ends of these strips are preferably provided with cross meinbers 26 engaging the lower tubes of the `adjacent tiers' to position the strips. In this central The ordinary p `the adjacent tire tubes; The temperature of the v vater in the space 23 is therefor-e almost as 'high as thatbetween any of the tiers of 4tubes. There is not sutliciently lower teinperature to cause the water to travel downwardly through the space, but instead the water will travel upwardly vas it does between `the other tubes, but at a somewhat -faster `rajte of flow. yThis flow, however, is confined bythe strips Qlrto vertical paths.

Althoughl :have shown .this particular vfurnace construction .as an ,eiiibodiinent `of iny invention, it is to be lunderstood that inany changes may be inade without vdeparting i'froiii the-scope or spirit of niy invention.

That I claiin is: I y

l. The combination with a boiler, of liori-` Zontal -ii're tubes therein larranged to provide a pair of adjacent groups with a vertical yspace therebetween, .a pair of spaced vertical circulating plates disposed ,in the yspace for providing yfor the downward flow oi water therebetween,l and transverse vertical strips at `longitudinal intervals between lthe plates ofthe pair .for precluding longitudinal eirculationbetweensaid plates V2. The combination with boiler having horizontal lire wtubes arranged in vertical tiers with enlarged spaces between certain of `the tiers,.of.a circulator for the boiler coinlprisiug a pair of spaced vertical circulating plates .disposed alongfthe sides of the respective' ,tiers Yof tubes .adjacent each enlarged space, vand transverse circulating ,strips extending across the height of the plates and disposed therebetween `at spaced :longitudinal .intervals for confining water passing between the plates to verticalpaths to .the exclusion 4of longitudinal How. V

3. The conilgqiiiationI of a boiler, a multi- V,piieity .Qt :horizontal fire ,tubes arranged `in a pair of adjacent groups leaving a verticalspace therebetween, a pair of spaced cir- Aculating `plates disposed within the space and in `Contact with the tire tubes adjacentr the respective sides of the space, ineaiisftor suspending the. plates at their upper edges, and transverse baffle strips extend/,ingsubm stantially the vheight of the plates andA dis- ,PQSQd tliere'between,"tlie 4lower ends of the strips embodying means for Lspreading the lower edges of the plates apart .to hold them yunder tension against the fire tubes, `whereby rounding Qt the .plates against the re tubes is precluded. f

4.- The Combination with a boiler having a inultiplicity ofi-fire tubesl therethrough ar.- reused. to forma vertical Space extending :from the rupper tire tubes to the lower. vfire tubes and provided withyspaced'vertical cirk v Gelatine platesV in Said Space. Suspended from their upper ends and 1n contact with the f adjacent fire tubes, of a plurality of trans- Cil verse strips extending transversely between the plates at spaced intervals for precluding longitudinal flow of water between the plates, the strips being slit a distance inwardly from their lower ends and the bifurcations of the strips thus formed being sprung apart for urging the plates into'tensional contact with the adjacent fire t-ubes for preventing pounding of the plates `thereagainst.

5. The combination of a boiler, a number of horizontal fire tubes arranged in a pair of adjacent groups with a vertical space therebetween, the uppermost tubes being a spaced distance below the normal water level of the boiler. spaced vertically disposed circulating plates in said space, a plurality of transverse circulating strips between the plates whereby the downwardly flowing vwater is confined to vertical paths, the strips extending to the uppermost tubes and thereabove being provided with transverse baille heads for checking longitudinall circulation of the water above the tubes.

6. The combination with a boiler having a multiplicity of horizontal fire tubes, the uppermost of which are a spaced distance below the normal water level of the boiler, of a plurality of transverse'baliles between the uppermost tubes and the water level spaced throughout substantially the length of the boiler for directly checking the longitudinal flow of water. v

7. In a boiler, a shell, a multiplicity of horizontal lire tubes extending therethrough and arranged in groups leaving a vertical space therebetween, the uppermost tubes be-l ing a spaced distance below the normal water level, a vertically disposed circulating plate extending through said space transversely thereof, and a transverse baille head secured to the upper end of the strip and extending over the adjacent lire tubes at the v upper end of the strip for checking the longitudinal flow of water above the tubes and for vertically positioning the strip.

8. A boiler comprising a shell, a multiplicity of longitudinal fire tubes therein arranged in groups with a vertical space ben tween adjacent groups defined by fire tubes of said groups for affording a relatively free passage for water vheated by said defininof fire tubes, and vertical baffle strips disposed at intervals along the spaceand extending tudinal movement of the upwardly flowing water in the space.

9. A boiler comprising a shell, a multiplicity of longitudinal fire tubes therein arranged with a vertical space between adjacent groups defined by lire tubes of lsaid groups for affording a' relatively vfree passage -for water heated by'said defining klire tubes, vertical baffle strips disposed at intervals along the space and extending trans'- versely thereof for precluding longitudinal movement of the `upwardly flowing water in the space, Athe uppermost of the adjacent tubes being a spaced distance below the normal water level of the boiler, and baffle heads at theupper ends of the strips extending transversely across said last mentioned tubes for checking the longitudinal flow of the water after it has flowed upwardly above the level of the tubes.

. l0. The combination withy a boiler of a multiplicity of longitudinal fire tubes arj in one of said spaces for shielding the space therebetween from the heat of the adjacent fire tubes whereby the space is left comparatively cool to permit the downward flow of waterfbetween the plates, vertical baffle strips disposed transversely between the plates for vconfining the water flowing downwardly therebetween to vertical paths, a lsecond vertical space between adjacent groups defined by lire tubes of said groups for affording a vrelatively free passage for lwater heated by said defining fire tubes, and vertical baffle strips disposed at longitudinalV intervals along the second .space and extending transversely across the second space for confining the upwardly flowing water therein to vertical paths. i f

-11. The combination with a boiler having a multiplicity of horizontal fire tubes therein arranged to .provide a pair of adjacentv groups with avertical space therebetween, of a pair of spaced vertical plates disposedin the space providing a passage for the down flow of water, and means for checking longitudinal flow of water in said passage coin-v 

